(note; only about a month late, but I just noticed a couple of typos... the hard 4 large numbers game should have a 25 in there too, and YZKYQOJ should be YZKXQOJ. Can you tell I put this together the night before the event?)

A selection of solutions are available here; http://imgur.com/a/0LunN
(for the puzzles which answers haven't been provided, you should be able to check whether your solution fits, and I'm lazy. If anyone is desperate for solutions I can knock them together.)